Stuffing box



Feb. 15, A' A, SCHRAMM STUFFING BOX Filed Feb. 20, 1926 Patente F.; 15,1192?.

'- f ALBERT A. sommaria, or orrrcaeo, n.mivors.

- lApplication iled February 20, 1926. Serial No. 89,568.

The present invention relates to stuffing boxes. -I a The present invention `has, very practical adaptability to refrigeratingl machinery and will be described in connection with such machinery, though it will be apparent as the de- -scription proceeds that the invention'is of l" has been known and used heretofore.`

A further object is t3 provide-a stung box -structurewhich providesless friction than has been involved heretofore and which providesfor the proper lubrication between the bearing surfaces in said stuiling box.

l A further object is to provideastuiing,

v`box structure in which' the area of bearing surfaces is reduced to aminimum, while the sealing qualities of said stuiing box struc-r ture are improved over prior practice.

Further objects will appearasthe description. roceeds.

Re erring to the drawings- Figure 1 is a sectional view. of a compressor such asv is used in' refrigerating plants, said section being taken along a lane which includes'the axis of the'driving shaft, thereof; and y Figure 2 represents a slight modification of the stuffing bnx structure shown in Fig-`A ure '1.

The numeral 1 indicates ahousng which provides bearings .for the vshaft 2, which may be driven from an outsideY source, as for example a pulley- 3. v'Said shaft is connected through connecting rods, the showing of which4 has been omitted for reasons of clarity,'to the reciprocatimg` plungers L1--4, which plungers reciprocate in cyl1nders having the cooling jacket 5. The numeral 6 in- .dicates a chamber for refrigerating medium,

which chamber is connected to the cylinders' within which the plungers 4--4 operate. The space within the housing 1, provided the'reciprocating plungers are used for c ompressing action, is under pressure, and 1t 1s necessary to provide a Agas or air-tlght stuifing box, whereb leakage along the shaft 2 will be prevente U Said shaft 2 1s rotatably mounted` upon the rollerbearings 7-7,

which roller bearings are provided at their inner sides with therings 8-8. A screw# threadedeLring 9, having threaded engage ment with a fixedfadjacent member, holds the outer roller bearing assembly securely in position within the cap portion 10 which may be securely bolted to the housing d1. The left-hand roller bearing assembly 7 may abut against a shoulder upon the shaft 2,

A being held against said shoulder by sleeve means which will be referred to hereinafter. Mounted for rotation with the shaft 2 are the sleeve.members 11-11,1Which have their adjacent ends mounted in abutting re.

lationship. with the collarl 12, Vwhich is also f' -rotatable with the shaft 2. Said shaft .2, sleeves 11- 11, collar 12 and the inner races of the ball bearingassemblies 7-7 rotate as a unit, the left-hand roller'bearing assembly 7 abutting4 against the shoulder 12a at the left-hand end of the'y shaft`- 2, beingv held in close engagement with said shoulder 12 by 'means of the nut12" at the oppo site end of the shaft 2. Encircling the shaft 2 with its sleeves.4 11-.11 andcollar 12 is the casing 13, .which casing" includes the outer sleeve 14 and the two inner sleeves 15-15. Said innersleeves 15e-15 have screw-` threaded portions for receiving the nuts 16-16 which nuts secure the diaphragms 17-17 upon said sleeves 15-15. The casing` 13 is securely mounted within thefhous- Sleeves 15-15 have their adjacent edge portions 18 rounded, whereby to have a relatively narrow region Tof contact with the sides ofthe collar 12. Springs 19--19 refact against the rings 8-8 tovurge the roundl ,y ed edge portlons of the inner sleeves 15-15 into bearing relationship with said collar 12.

Accordin' towthe modification shown-'in Figure 2, t esleeves 11-11 and collar 12 are formed into a single member, indicated the numeral 20, whichsingle member has allof the functions of `the three members 11-.11 and 1,2' shown in Figure 1.

.The casing@ 13 willn-ordinar'ily be filled with a heavy grease whereas the space o1it.y

f side of said casing 13l will provideauresering high as the lowermost 'portion oit the shaft 2;'

v within the housing The pr therefor-e5 voir `for lubricating material of lighter weight.V The level of said lighter lubricatm'aterial vwill ordinarily be at least as the. drawing, which "action will force the rounded extremity 18 of the lefthand sleeve 15 into .close en agement with thec'ollar 12.

lThis action wil supplement the action of @the left-hand spring 19. The additive actions of .the pressure within the housing" 1 and the pressure of the left-hand spring 19' will esu t inan eiectiveseal between the lrounded edge portion of the left-hand sleevev 15 andthe collar 12.

When the device used yas 'a suction ump, wherebyfvgtheQV-pressure within lthe housing 1 will ,hereduced below atmospheric ressure, the right-hand diaphragmwill be I? vmoved to the left, resulting in the 'ressure tion is applicablagtherefore,

sure pumps and suction pumps without. change in the box structure.

- lMany modifi )skilledin the art. 'It intendedtovcover 'of the right-hand sleeve 15 aga1nst the" j 'right-hand face of the collar 12 as the parts' are viewed in Figure; 1. The present-invenot to presflhe illustrated em iments vof the"pres- Jexit: invention have. been hosen".merely for thepurpose of explaining 'thai-Invention and should not be considered in a'limitiig sense.

cations to' those Pressure from esent inventionhas the advantagethat Iwith 'a' min'lhum of bearing-- surface animproved sealingl isi effected.`

all such modifications that fall withinthe scope of the appended claims.

l claim: p

1; lin stuilingbox structure, in combination, a relatively stationary member, a rotatable shaft, bearings for supporting said shaft from said stationary member, an an nular collar rotatable with said shat,-a pair vo diaphragms having air-tight connection with Asaid Astationary `member, sleeves encircling said shaft having airtight connection with said diaphragms near l the center portions of said diaph'ragms, said sleeves having rounded edge portions adaptedto engage with the two sides of said collar and spring lmeans for urging said sleeves into engagement with saidc0llar.

2. In a refrigerating pump, a housing i adapted to have a pressure set up therein either higher than atmospheric pressure or to have the vpressure therein reduced below. atmosphericpressure, a. rotatable shaft ex- Otending from the inside of said housing to the atmosphere, bearings for supporting said shaft, an annular collar rotatable with saidshaft; a' pair' of l"diaphragme having' 4sleeves encircling said'A shaft having air- I tight connection'withsaid diaphragxns near' the center portions of said diaphragms', said vsleeveshavrng rounded edge portions adapt' V edfto engage with the'twosi es of said col lar,l and coil springs enclosing said shaft for urging said sleeves intoenga ementwith said c( llar-,L whereby one of sai springs has an additive action within said housing when saidv pressure is above atmospheric pressure and wherebyth'e other of'said s rings has v an additive actionv cooperating with ritmos-' -pherio pressure whenthe' pressure Within said housing,l is below atmosphericpressure. '.Sliigned at' Chicago, I11inois,this -12thday ..ofebruary; 1926.

ALBERT A. vscHRAM-M.

lo air-tight vconnection with said housmg,` 

